package com.heima.app.gateway.filter;

import com.heima.app.gateway.util.AppJwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.util.StringUtils;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

/**
 * author Link
 *
 * @version 1.0
 * @date 2025/4/3  9:28
 */
@Component
@Slf4j
public class AuthorizeFilter implements Ordered, GlobalFilter {
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {

        //1.获取request和response对象
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();

        //2.判断是否是登入
        if (request.getURI().getPath().contains("/login")) {
            return chain.filter(exchange);
        }
        //3.获取token
        String token = request.getHeaders().getFirst("token");
        //4.判断token是否存在
        if (StringUtils.isEmpty(token)) {
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        //5.判断token是否有效
        try {
            Claims claimsBody = AppJwtUtil.getClaimsBody(token);
            int result = AppJwtUtil.verifyToken(claimsBody);
            if (result == 1 || result == 2) {
                //无效
                response.setStatusCode(HttpStatus.UNAUTHORIZED);
                return response.setComplete();
            }

            //.获取获取用户信息
            Long id = Long.valueOf(claimsBody.get("id").toString());

            //储存到header中
            ServerHttpRequest serverHttpRequest = request.mutate().headers(httpHeaders -> {
                httpHeaders.add("userId", id + "");
            }).build();

            //重置请求
            exchange.mutate().request(serverHttpRequest);

        }catch (Exception e){
            e.printStackTrace();
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }

        //6.放行
        return chain.filter(exchange);
    }

    /**
     * 优先级设置，值越小，优先级越高
     *
     * @return
     */
    @Override
    public int getOrder() {
        return 0;
    }
}
